@Haji, please tell us more about what you are trying to do, so that we can answer your question. IBM Bluemix is an app development and runtime platform. Are you trying to build apps for IMX? What kind of apps?

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Are you sending as a device or an application? It sounds like you are using i.MX (innovative Multimedia eXtension). Can you let us know what type of device?Are you using the Paho embedded C client?

There are device client libraries written for embedded c and C++. However these are specifically written for devices.
If you are publishing as an application, you could use the samples provided in the Git repository and then follow the documentation provided here to post commands (or an event on the behalf of devices) to Watson IoT Platform.

Also, the online Bluemix documentation has information about application development and getting started with Watson IoT platform.